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Finding the Fourth Proportional to 87,220.80, 130,831.20 and 80,740.80

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Solution

The fourth proportional to 87,220.80, 130,831.20 and 80,740.80 is: 121,111.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,220.80 : 130,831.20 = 80,740.80 : x
  2. Step 2: Convert to fraction form
    87,220.80/130,831.20 = 80,740.80/x
  3. Step 3: Cross multiply
    87,220.80x = 130,831.20 × 80,740.80
  4. Step 4: Simplify right side
    87,220.80x = 10,563,415,752.96
  5. Step 5: Solve for x
    x = 10,563,415,752.96/87,220.80
  6. Step 6: Final answer
    x = 121,111.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.